condition mean min max ZT0-3 37.201975 33.8749 40.52905 ZT4-7 24.29765 24.29765 24.29765 ZT8-11 32.3967 32.3967 32.3967 ZT12-15 0 0 0 ZT16-19 41.76775 41.76775 41.76775 ZT20-23 36.67015000000001 36.67015000000001 36.67015000000001